JP2015174084A - Sludge scraping device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sludge scraping device where a cleaning action at a downstream side is accelerated by reducing the flow amount of floating sludge to the downstream side at an upstream side and scraping load is reduced by reducing a sedimentation amount at the downstream side.SOLUTION: In a sludge scraping device where: wheels are disposed at respective low positions near a basin bottom at a pit side in a sedimentation basin having a pit at one end of an upstream side and an anti-pit side being a downstream side; a circulation chain such as a plate type schain, a link type chain and the like is freely bridged between the front and rear wheels; and flights are attached to the outer periphery of the circulation chain in a circumferential direction at predetermined intervals, the flights make scraping postures projecting downward when advancing in a pit direction and, on the other hand, return in falling states at upper circulation.

Description

  The present invention relates to a sludge scraping device.

The sludge scraping device is installed in a rectangular sedimentation basin with a pit at one end of the pond and is configured to scrape and deposit the sludge accumulated on the pond bottom from the pond bottom to the pit side. There is a chain flight type as a general one. This chain flight type is capable of circular motion by winding the chain endlessly via a drive-side sprocket provided upstream in the sedimentation basin and a driven-side sprocket provided downstream. In addition, a plurality of flights that are parallel to each other and spaced apart from each other are provided, and the sludge is scraped to the pits by advancing these flights along the pond bottom in the pit direction.
An example of such a chain flight type sludge scraping device is shown in Patent Document 1.

  Japanese Patent Laid-Open No. 3-238006

In the technique disclosed in Patent Document 1, the sludge scraped in the pond is attached to the chain disposed in the settling pond at predetermined intervals so that the sludge settled on the bottom of the pond is scraped to the pit. Regarding the aircraft, both the conventional type where the flight does not rise and the new type where the flight rises are described.
Regardless of the type of sludge scraper that has any type of flight, it is a four-axis drive system with four rotating shafts, and the movement of the flight is a forward movement that rakes in the pit direction along the pond bottom. In addition, the upward movement that rises in the flow straightening zone from the flow straightening plate, and the upward horizontal movement that moves from the upstream side to the downstream side while floating on the water surface and simultaneously rakes the floating scum toward the scum removal device. , And a return motion returning from the end toward the take shaft side which is the downstream side and the pond bottom side.
If the system returns to the scraping state through such a large surplus, the sludge to be settled on the upstream side will be sent to the downstream side, and the amount of scraping in the pit direction will be increased accordingly. This increases the operating cost. In addition, if the route is greatly routed upward, the total weight of the chain and the flight increases, and the operating cost for scraping increases accordingly. In addition, if the route is largely routed upward, the chain with the flight will be operated while receiving the vibration due to the earthquake, and the chain with the flight will be easily detached from the drive sprocket and may be forced to stop operation. is there.
In order to improve such a situation, the endless chain is spanned between the front and rear sprockets, with the rotation shaft with sprocket as the only two locations on the downstream end side, which is the same height as the position just above the pit side. It has been found that when the flight is arranged on the outer periphery of the chain and the scraping at the bottom of the pond is finished, it is possible to immediately return to the sprocket on the downstream end side without passing through the upper part largely. If it says here, it is also called a low-layer circulation system, but if the same system is adopted, the above-mentioned problems are solved well.
However, if this low-layer circulation system is followed by the conventional circulation method, the flight will return the low-rise area to the downstream direction if it is made to circulate with the flight fixedly standing on the outer periphery of the chain. As a result, it seems as though there is no sludge sent downstream due to flight, but in reality, the sludge that remains without being completely settled in the upper part of the lower layer tends to stay while floating slightly. As a result, the flights that have stood up are slowly sent to the downstream direction, and then the sludge gradually accumulates on the downstream side, and the purification action on the downstream side cannot be obtained completely. At the same time, there is a risk that the amount of settled sludge from the suspended sludge will increase, increasing the load on scraping in the pit direction.

  The present invention is intended to solve the above-described problem, and suppresses the sending of floating sludge on the downstream side to the downstream side so that the purification action on the downstream side is promoted and the amount of sedimentation on the downstream side is reduced. An object of the present invention is to provide a sludge scraping device that reduces the scraping load.

  In order to achieve the above-mentioned object, the invention according to claim 1 is such that the pit side in a sedimentation basin provided with a pit at one end on the upstream side and the pit side closer to the downstream side are closer to the bottom of the pond. A wheel is disposed at a position, and a circulating chain material such as a plate type or link type chain is circulated between these front and rear wheels so as to be freely circulated, and a predetermined circumferential direction is provided on the outer periphery of the circulating chain material. A sludge scraping device to which flights are attached at intervals, so that when the flight moves forward in the pit direction, the flight is in a scraping posture that protrudes downward, while in the upper direction, it returns in a prone posture It is configured.

  As described above, according to the first aspect of the present invention, the wheel is arranged at a lower position near the bottom of the pit in the sedimentation basin having a pit at one end on the upstream side and on the opposite pit side on the downstream side. In addition, a circulating chain material such as a plate-type or link-type chain is freely circulated between these front and rear wheels, and the outer periphery of this circulating chain material is flighted at a predetermined interval in the circumferential direction. Is attached to the sludge scraping device, and when the flight advances in the pit direction, the flight is configured to scrape downward and protrude upward while returning to a prone posture. In order to reduce the amount of sedimentation on the downstream side and reduce the amount of squeezing load, the floating sludge on the upstream side is suppressed to the downstream side and the purification action on the downstream side is promoted. Dirty It is possible to provide a raking device.

  The apparatus top view which shows one Embodiment of this invention seeing FIG. 2 from the top.   II-II sectional view taken on the line of FIG.   III-III sectional view taken on the line of FIG.   Side sectional drawing which shows other embodiment corresponding to the IV-IV line of FIG.   VV sectional view taken on the line of FIG.   Side sectional drawing which shows other embodiment corresponding to the VI-VI line of FIG.   VII-VII line sectional drawing of FIG.   The perspective view which shows the flight attachment structure of FIG.   The longitudinal cross-sectional view which sees other embodiment from the front.   The longitudinal cross-sectional view which sees other embodiment from the front.   The longitudinal cross-sectional view which sees other embodiment from the front.   The longitudinal cross-sectional view which sees other embodiment from the front.   The longitudinal cross-sectional view which sees other embodiment from the front.   The sectional side view of the sedimentation basin which shows other embodiment.   The sectional side view of the sedimentation basin which shows other embodiment.   The sectional side view of the sedimentation basin which shows other embodiment.   The top view which shows the example at the time of employ | adopting a link chain as a circulation chain material.   The top view which shows the other example of a link chain.   The top view which shows the other example of a link chain.   The sectional side view of the sedimentation basin which shows other embodiment.

  An embodiment of the present invention will be described below with reference to FIGS. In these figures, 1 is a rectangular sedimentation basin. In FIGS. 1 and 2, the left side is the upstream side and the right side is the downstream side, 2 is the upstream end wall, 3 is the downstream end wall, and 4 is the rectangular length. In FIG. 2, left and right side walls 5, which are side edges, are pond bottoms that are extremely slowly lowered and inclined toward the upstream side, and 6 is a (sludge) pit formed at one upstream end of the pond bottom 5.

  Further, reference numeral 7 denotes an upstream end porous rectifying plate, through which the sewage is rectified in the right direction of FIGS. 1 and 2 and slowly flows. 9 is a suction pipe connected to a pump for sucking the sludge collected in the pit 6 together with water and guiding it to the next treatment tank, 10 is installed on the water surface 11 and the floating scum is periodically removed from the weir 10a. A scum removing device 12 for swallowing together with some water by a downward movement and discharging them to the outside through a scum pit, 12 is an overflow weir installed on the downstream water surface. Reference numeral 13 denotes a pair of left and right (pond bottom) guide rails that are already or newly provided in a partially protruding manner on the pond bottom 5.

  The chain flight type sludge scraping device of the low-rise area circulation type is slightly higher than the pit 6 on the pit 6 side and slightly higher than the pond bottom 5 on the downstream side opposite to the end wall 3 on the anti-pit side. A pair of left and right bearings 16 are fixedly arranged on each of the two through a bracket 15, and a front and rear rotary shaft 17 is mounted between the bearings 16, and a pair of left and right rotary shafts 17 are disposed around the front (upstream) rotary shaft 17. A drive sprocket (wheel) 18 and a pair of left and right driven sprockets (wheels) 19 are attached to the rear (downstream) rotating shaft 17 so as to be able to rotate synchronously. Each of the sprockets 18 and 19 is a sprocket for a plate chain, but may be a sprocket for a link chain.

  A driven sprocket 24 to which low-speed power from a drive sprocket 22 provided in a drive source 21, which is a motor with a speed reducer, is transmitted via a chain 23 around the front rotary shaft 17. As a result, the front drive sprocket 18 is rotationally driven in a clockwise direction as indicated by the arrow in FIG. 2, and the rear driven sprocket 19 is also rotationally driven in the same direction. Therefore, between the drive sprocket 18 and the driven sprocket 19, chains (circulation chain members) 25 and 25, which are plate chains, are spanned so as to be capable of synchronous rotation. Of these chains 25, flights 27... Are attached via chain members 26 to the chain plates that are spaced apart from each other in the circumferential direction, and are attached so as to be swingable back and forth via a shaft 28.

  Since the flight 27 is a material that sinks in water, the sludge is scraped and advanced in a vertically lowered posture. The flight 27 returns automatically (returns to) when it is above the drive sprocket 18 due to its weight. The weight of the upper flight 27 always applies tension to the upper chain 25 while being pushed down. As a result, this apparatus does not require a chain tension adjusting device. However, it is possible to make the tension adjustable by moving and adjusting the front rotating shaft 17 side in the direction of the end wall 2 instead of the rear side (downstream side) unsuitable for movement adjustment.

  It should be noted that the flight 27 coming to the end on the downstream side is rotated 90 degrees or more around the driven sprocket 19 as it is, and then it is reversed at a stroke. However, the flight 27 approaches the driven sprocket 19 as shown in FIGS. By providing the curved guides 29 facing each other, the flight 27 is rotated slowly and switched to the scraping posture. The guide 29 does not allow the flight 27 to rotate at first so that the height of the flight 27 is 1/3 → 1/2 → 1/1 of the height of the driven sprocket 19 with respect to the height of the flight 27. The interval is increased so that the state gradually changes from the state to the state allowing rotation. By controlling the guide 29, the flight 27 does not suddenly reverse and slowly reverses, so that sludge winding due to the reverse is prevented and the shaft 28, the chain 25, and other circulating drives that support the flight 27 are driven. The driving load is not applied to the system.

  As shown in FIG. 3, the flight 27 is provided with a shoe 30 that slides on the guide rail 13 so as to guide the flight 27 while restricting the movement in the width direction to be constant. As shown in the lower right column, a traveling roller 31 may be attached so that it can be guided by smooth rotation without sliding.

  Since the flight 27 moves in the sedimentation basin 1 as a low-level circulation system and returns while maintaining a low posture by overturning, the fluffy floating sludge X as shown in FIG. Even if it exists, there is no risk of scraping it in the downstream direction, so that the water quality in the downstream area is improved, the sediment is reduced, and the scraping load in the pit direction is reduced.

The sprockets 18 and 19 are separated and independent on the left and right, but may be integrally connected as shown by phantom lines in FIG. The flight 27 may be lighter after securing the scraping ability so that the base side is light and the tip side is heavy.
The flight 27 has a scraping posture due to its weight, but as shown in the lower column of FIG. 2, a stopper is provided on the projecting piece of the chain 25 itself or on the hinge portion of the horizontal member 26 attached to the chain 25. 33 may be provided so that the flight 27 has a scraping posture, and the upper side may be configured to fall forward and fall down.

  4 and 5 show another embodiment. In this embodiment, the drive sprocket 18 (driven sprocket 19) is a single piece only at the center of the width of the rotary shaft 17, and the structure is simplified. In order to stabilize the flight 27, the support shaft A plurality of 35 are horizontally mounted and a flight guide 37 is provided on the axis via left and right brackets 36 so that the flight 27 is received and slid from below.

  6 to 8 show another embodiment. In this embodiment, the driving sprocket 18 (the driven sprocket 19) is circulated as a single sheet type in the center of the pond width direction or a pair of left and right as shown in FIG. A pair of left and right circular guide rings 40 made of rods and formed into an elliptical orbit about the horizontal axis are guided to rotate around the shoe 41 on the flight 27 side. As shown in FIGS. 7 and 8, the chain 25 to which the flight 27 is attached is connected to the flight 27 through a bracket 42 with a slightly higher mounting base 25a, and the circular guide ring 40 is connected to the connecting plate 44 or the brace. 45 and the like are provided therein, and a pair of left and right elliptical tracks are formed around the horizontal axis by attaching the connecting plate 44 to a plurality of horizontal bars 46, 46 mounted between the side walls 4, 4. Have been deployed.

As shown in the upper column of FIG. 7, the shoe 41 has an L-shaped base bracket 41 a to be attached to the flight 27 and a quarter arc-embedding portion 41 b integrated at the tip thereof. The left and right pairs are formed as a set so as to be held so as not to come out of the circular guide ring 40.
The elliptical track of the circular guide ring 40 is a slightly larger track than the elliptical track of the chain 25, but may be a track having the same dimensions. The shoe 41 may be smoothly guided by attaching a small traveling roller. Further, as shown in FIG. 7, a common bar 47 is provided to be connected to the shoe 41 and the bracket 42, and the flight 27 is rotatably supported via a hinge 48 as a supporting role as shown in FIG. Alternatively, the flight 27 may be configured to be tilted upward.

9 to 11 show another embodiment of the circulating guide ring. O shown in these drawings is a center line between the widths of the flights 27.
The circular guide ring 50 shown in FIG. 9 has a cross section of a square pipe, and a mating shoe 51 also surrounds the square pipe. In this embodiment, the sprockets 18 and 19 are single on the center line, but may be a pair of left and right types as shown in FIG. Reference numeral 52 denotes a travel roller provided on the shoe 51.

  Although a pair of left and right sprockets 18 and 19 shown in FIG. 10 are provided, a single center type may be used as shown in FIG. The circling guide ring 55 is a square and inclined 90 degrees, and the shoe 56 is also shaped accordingly. Reference numeral 57 denotes a traveling roller.

  The circular guide ring 60 shown in FIG. 11 is a triangular pipe, and the shoe 61 is also a combined type. The circular guide ring 60 may use an angle material as shown in the lower right column.

  In the embodiment shown in FIG. 12, the sprockets 18 and 19 are a single piece in the center, the circular guide ring 63 is also a single piece (monorail), and the shoe 64 is also arranged in the middle of the width of the flight 27.

  In the embodiment shown in FIG. 13, the sprockets 18 and 19 are a single piece in the center, and the circular guide ring 66 is a single piece (monorail), and is particularly made of a square pipe. A traveling roller 67 is attached to the mounting bracket 25a of the chain 25. As shown in the right column of the figure, the circular guide ring 66 may be constituted by a main body side a and an adjusting body side b capable of moving back and forth so that the tension of the chain 25 can be adjusted.

FIG. 14 shows another embodiment, and this embodiment adopts a sludge scraping apparatus A of a chain flight type and particularly a low-layer circulation type so as not to scrape the suspended sludge X in the downstream direction. At the same time, as countermeasures against the floating scum, the front and rear shafts 70 and the sprocket 71 are arranged below the water surface 11 of the scum removing device 10, and the front sprocket 71 is connected to the shaft 70 by the drive sprocket 22 and the chain 23 of the drive source 21. The surrounding driven sprocket 24 is driven to rotate, and the pair of left and right scum chains 72 are driven to rotate clockwise in the figure. The scum chain 72 hangs downward and travels horizontally with a guide rail or the like, and a plurality of scum flights (scrapers) 73 are provided on the outer periphery of the chain 72 so that the sludge is suspended when passing under the scum. The X is scraped back to the upstream side, and the scum floating on the water surface 11 is scraped up and sent to the scum removing device 10 in the upward direction. The driven sprocket 24 and the driven sprocket 24 on the sludge scraping device A side can be interlocked by a connecting chain 74.
In addition, the suction pipe 9 of the pump for sludge removal is provided with a throttle, and the suction pipe 75 is inserted so as to communicate with the inside of the suction pipe 75, and the sludge X is generated by utilizing the negative pressure suction force during operation of the pump 9. At the same time, it is sucked out through the suction pipe 9.

FIG. 15 shows another embodiment. The same embodiment shows another embodiment in which the floating sludge X is scraped back and the floating scum is sent to the scum removing device side. Reference numeral 78 denotes front and rear shafts, 79 denotes a sprocket, and 80 denotes a scum chain. A base flight 81 provided on the outer periphery of the scum chain 80 is provided with an outer peripheral flight 82 to be rotatable. As a result, the outer periphery flight 82 hangs down and scrapes the floating sludge X in the lower direction, and the base flight 81 functions to scrape the scum in the upper direction.
In addition, the outer periphery flight 82 is reversed and overlapped with the rear side of the base flight 81 in the upper direction, and even if the floating sludge X scraped down in the lower direction adheres and stays on the surface, they are directed downward during the reversal motion. The outer periphery flight 82 is configured to be stopped by a stopper at an angle reversed by about 90 degrees with respect to the base flight 81 as indicated by a broken line 82 (a) in FIG. Good.

  FIG. 16 shows another embodiment, which is a sedimentation basin 1 equipped with a device similar to the low-layer circulation type sludge scraping device A shown in FIG. 1 to FIG. In order to be able to perform on the upstream side, a plurality of front and rear hanging support bars 85 are horizontally placed above the upstream side of the apparatus A, and a settling accelerator 86 is suspended on each bar 85 to promote settling. It is like that. The settling accelerator 86 is a link chain or mesh. As shown in the drawing, if the settling promoting material 86 is made to gradually narrow in the front-rear interval from the downstream side toward the upstream side, the settling is promoted on the upstream side. In addition, by setting the lower part of the settling promoting material 86 to face the region where the floating sludge X is generated, the sediment that has settled from the promoting material 86 becomes settled beyond the floating sludge X region. Generation of X can be suppressed.

  The embodiment of FIG. 17 is a plan view showing how to attach the chain 88 and the flight 27 when the circulation chain material is one (or two) link chains 88. A specific one of the chains 88 having a certain front and rear interval is composed of a pair of front and rear shackle bodies 89a and 89a having a mounting piece a as both wings and a U-shaped body portion as a special shackle 89 for mounting the flight 27. When both the shackle bodies 89a and 89a are fastened from the front and rear by the fastening device 90, the flight 27 is attached by being fastened together with the projecting pieces 27a and 27a on the flight 27 sandwiched therebetween. The link chain 88 can be applied to other embodiments. Also in the case where a pair of link chains 88 are provided, the illustrated ones are arranged symmetrically.

  FIG. 18 shows another example in which one or two link chains (circulation chain members) 92 are provided and the flight 27 is attached thereto. A specific one of the chains 92 having a certain longitudinal interval is a special joint 93 for mounting the flight 27, and a square plate-like main body 93a with a hole and an installation projecting integrally with the main body 93a. The front and rear links are connected to the hole, and the flight 27 is attached to the attachment plate part 93b via a projecting piece 27a and a fastening tool 90. Also in the case where a pair of link chains 88 are provided, the illustrated ones are arranged symmetrically.

  FIG. 19 shows another example in which the flight 27 is attached by providing two link chains (circulation chain members) 96 and providing the projecting pieces 27a to them. A specific chain 96 having a certain distance in the front-rear direction is a special shackle 97 for mounting the flight 27 by forming a pair of front and rear on a main body 97a composed of a pair of front and rear U-shaped parts and a connecting part connecting the ends thereof. An extended attachment piece 97b is provided, and when the two shackle bodies 97 are fastened from the front and the back by the fastening device 90, the flight 27 is attached by fixing them together by sandwiching the projecting pieces 27a, 27a on the flight 27. Like that.

  In the embodiment shown in FIG. 20, the sedimentation of the suspended sludge X is promoted by the low-layer circulation type sludge scraping apparatus A itself. 100 is a driving sprocket, 101 is a front sprocket, and 102 is a rear sprocket. A flight 104 is arranged on a chain 103 hung on these, and the lower part rakes in the direction of the pit 6 and returns to the downstream side later on the upper part. In particular, the flight 104 is in a front-lowering state at the time of scratching, while being lifted back at the time of returning (returning). As the return movement is performed, the suspended sludge X flows downward and upstream as indicated by the broken-line arrow to promote sedimentation to the pond bottom. The driving sprocket 100 is arranged at the upper side and the angle is adjusted so that the chain 103 is lowered at an angle from above in order to reduce the initial angle of the flight 104 and make it easy to cause a flow. In order to define the flow, a plurality of control guide plates 105 are arranged in the track inner region of the chain 103 through which the flow passes.

    DESCRIPTION OF SYMBOLS 1 ... Precipitation pond 5 ... Pond bottom 6 ... Pit 7 ... Current plate 17 ... Rotary shaft 18, 19 ... Sprocket (wheel) 21 ... Drive source 25 ... Chain (circulation chain material) 27 ... Flight.

Claims (1)

  Wheels are arranged at low positions near the bottom of the pit in the sedimentation basin provided with pits at one end on the upstream side and on the opposite pit side on the downstream side, and between these front and rear wheels, there is a plate. A sludge scraping device in which a circulation chain material such as a mold or a link type chain is circulated freely circulated, and a flight is attached to the outer periphery of the circulation chain material at a predetermined interval in the circumferential direction. The sludge scraping device is configured so that when it advances in the pit direction, it has a scraping posture that protrudes downward, and when it moves upward, it returns to a prone posture.

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